Cheap But Loud Firecracker

Well this is my first instructable so please don't be to harsh on me.

Warning!!!
This has to do with fire and fire = burn so be careful.

I am not responsible for any harm these things do.

Materials:
1) Aluminum foil
2) Scissors
3) A book of matches

Cut a 3" by 3' square piece of aluminum foil and leave it aside for now.

Then take your scissors and cut the heads off all the matches.

Place all the matches on the aluminum foil and wrap it tightly keeping all the match heads in a tight pouch.

Bring it outside and place it on concrete.

Then take a large rock. a metal weight, or a sledge hammer. and strike it very hard.
Then BOOOOM!

http://www.youtube.com/watch?v=W4_j4rQEGDg